curriculum/challenges/english/blocks/learn-classes-and-objects-by-building-a-sudoku-solver/6606b961ebcf04460f8af76e.md
Test that the find_empty_cell method works properly by calling it on gameboard and printing the result.
Note that, although find_empty_cell is defined with one parameter, you must not give it a value by passing an argument to the function call, since self is automatically passed in as the object you are calling the method on.
You should print gameboard.find_empty_cell().
({ test: () => assert(runPython(`_Node(_code).has_call("print(gameboard.find_empty_cell())")`)) })
class Board:
def __init__(self, board):
self.board = board
def find_empty_cell(self):
for row, contents in enumerate(self.board):
try:
col = contents.index(0)
return row, col
except ValueError:
pass
return None
puzzle = [
[0, 0, 2, 0, 0, 8, 0, 0, 0],
[0, 0, 0, 0, 0, 3, 7, 6, 2],
[4, 3, 0, 0, 0, 0, 8, 0, 0],
[0, 5, 0, 0, 3, 0, 0, 9, 0],
[0, 4, 0, 0, 0, 0, 0, 2, 6],
[0, 0, 0, 4, 6, 7, 0, 0, 0],
[0, 8, 6, 7, 0, 4, 0, 0, 0],
[0, 0, 0, 5, 1, 9, 0, 0, 8],
[1, 7, 0, 0, 0, 6, 0, 0, 5]
]
gameboard = Board(puzzle)
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